Malicious Office (OOXML) / .XLSX — malware analysis report

Static analysis result for SHA-256 a289979e75a62548…

MALICIOUS

Office (OOXML) / .XLSX

619.4 KB Created: 2023-07-26 19:45:53 UTC Authoring application: Microsoft Excel 12.0000 First seen: 2023-09-07
MD5: 9e05137b1d228061562c75edc1cb3de2 SHA-1: a097eecc4c02176c94f3e8f0891c837abecc3ac6 SHA-256: a289979e75a6254869afab2e0066bcdc82f3e862ba29abf31f1eb99c90b54e28
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The file is an Excel spreadsheet containing an embedded OLE object, specifically identified as an Equation Editor object. High-severity heuristics indicate that this Equation Editor object carries a payload-like Ole10Native stream with an anomalous size, strongly suggesting it's being used to exploit a known vulnerability like CVE-2017-11882. This technique is commonly used to deliver a second-stage malicious payload.

Heuristics 3

  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Embedded OLE object xl/embeddings/gIIEM5io.iejXxO contains the Equation Editor CLSID, the legacy component exploited by CVE-2017-11882, CVE-2018-0802, and CVE-2018-0798.
  • Equation Editor object carries payload-like Ole10Native stream high OLE_EQUATION_OLE10NATIVE_PAYLOAD_ANOMALY
    Embedded OLE object declares the Equation Editor CLSID but stores a large high-entropy Ole10Native stream with malformed package sizing. This is an exploit-shaped Equation/OLE payload container seen in malicious OOXML samples. It is not assigned to a specific CVE unless the MTEF/Equation Native primitive also matches.
  • Embedded OLE object medium OOXML_OLE_OBJECT
    Document contains an embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ooxml_oleobject_00.bin
8769d36c69f5b3486c0150a55f68132834524ddc6cb1474d026a47f5a1a5cb02		 ooxml-ole-object OOXML embedded OLE part: xl/embeddings/gIIEM5io.iejXxO 931328 bytes
ooxml_oleobject_00_ole10native_00.bin
7d9d51308fd36bd9c895baa72573ec5a2f5c9dc4a73331b3f11a292ba1df8c55		 ole-package OOXML xl/embeddings/gIIEM5io.iejXxO Ole10Native stream: OLe10NatIVE 921320 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.